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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836b93a8a1ce160255df526401f99364e1e7f030145670d1110d43cb98f4d589' 
  AND token = 'yhNG32JWeGsqGcADdLPmIm/UQXdqX+IdDeJRSZhdluo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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