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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61276c0f8ca912f1aa4cd1626b6b99b63c35c365a5718695a21d0da5cd1dec19' 
  AND token = '5OmtAEFBUYbktpffGRSnWC0fN84J9qmvtr5OqSG5Nmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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