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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99300b060cdd5a03b30e1aa4a659df5a903edd210a3fae9b11b13178dfa94b05' 
  AND token = 'fiQaSARP0GnZT87EzW2S6uR09/ySKa1qrZHSM0cABbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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