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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0602e5506bdc0a0ab8547a43002ec8c5592eac8b9c47c7af6e2850e6be5bca0' 
  AND token = 'px0obtWz83G4LVHNlyRThEwrSqQ6KNVHlv3561zhUnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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