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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cc31ee54dce365de2fb59bc1b8c5d21b730aeeaf795b3804c81044e167bf83' 
  AND token = '0o957jkRMk5HrkQkj23mnArpdpB4xFscOm7G4a2As/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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