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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9093a916b3b5f21003259d1c32a312a0993d5bfa507ab25bd7010eb4dcb5225f' 
  AND token = 'Qo2DUi8HfPSXaOU4epCJNCGg9RCVFjW4yN7wDiw6lSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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