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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5fb3d221461cfe793693d0ec6646bc15a74a1835be3ad05abc83f35621f29e' 
  AND token = 'r69q0Y83T+gY2ld8jJ8UJhh7DNuoPdWgpOPWGKtrN3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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