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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c784a1b51eb544733291a654950aeff7bb79e8829190c09cb104a07fc9f328' 
  AND token = 'MfGlSKWEe/PC5zbQQELw4Aj9Ku1FYaT6+3g8AVa+QLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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