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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ec303f7e04326a31738b611bea9d1c23e7003a6d0e62b51d293a5dbe2d1803' 
  AND token = 'WKLjMVKL52GuJld+WBp0vaeuheWPYVLchXz62iIajpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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