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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ae91f4f2df7afc0b31d08d56dd45f5ecba162250c7d4f7b88c84604de2e1e8' 
  AND token = 'FAPylGSauvqjsPOc8qZ2i+iCibHp8XKLXnom4UlRnmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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