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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74015ab4a813bcdba85d294f447a94546be60e7d7df7004efe2ea400d1a8277a' 
  AND token = 'uBKy0tyIzVywG/LiAareRANhKxjPz9VW13JCxWzyDOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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