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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472a0bcfafc34cdcb9c513bb9181e035bd90957cab6bc1d5900679d76030679c' 
  AND token = 'I3yh9e5KQWXWZ9qKqbdW5dVg2G6k9qSQj4iX8oa9+JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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