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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8328172e80276fa22ae119df178446d42cdf84369d84353fd7935bf75cb9d2' 
  AND token = 'Wf1iGnmua1hKqWn4ES82KpCjSAy6WP2v2uCTpDBWYHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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