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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7857735d63b9bd77eddabb01403f849d8b89acb8c05afa8e34a37785c49a1976' 
  AND token = 'h6Ej+y06SDyCsTro/hNxBMJbmDhQc1SQMl82Kzpekf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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