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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6559fa351cb43ff7609adc47d10b25a59f3a8ed951517ee4094da87569ffa2' 
  AND token = 'V1G52XV18k+5lOv/rVuAO1VqWdxi3SSz5GYMSKxjI+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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