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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918fdbe896cd81ea8a3034e32c98378d5d670fa55a4a75b64ef3fdd5c701a62c' 
  AND token = 'PRJRXd8A61NGJ3Np0KnC9pI0fUIjs4FbG9iAuMlgwL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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