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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd992ed80291e121cef6dc8c1ea835b5c8b0eb3bc64e107f39e8caec544e810ff' 
  AND token = 'rQSiP1gQVWPXVbbMOtF+spugNdgAIA4nnNoVl39m97o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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