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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad62a249053a161d2a97057a4f8ade29ba5b5011e15d298a7eccceb8d2fec3b2' 
  AND token = 'lYfTjOhqtbISvm1Bx7IwF5HbVupfzDO7AFTg4NgZbag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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