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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf4135856750916f6cc252cbdb8198fd3599cb9b6ba6bb39bd235d50b803938' 
  AND token = 'Q7X7LFsisf8EuPGaD+c2jrqSu/Ms6Z83JUu0I0Hg+TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}