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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5665bf4a7f040e00de6769dc963cfb198c48a65580b8a6732884f0632d392a1e' 
  AND token = '2RsUnyu/DvlVUx130Q7/bcEy+c81wgQd4H+e174SluA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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