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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4430916b1ccaba1d403481eacecb6c03781a77ca4d191b03698d0119a517bab9' 
  AND token = 'Gi4z9b28/h38jqZcAFLM5ejEvhc7bazO3glxFyO/3eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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