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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67933152d54fc583cb536803eb86be7bd642582bec35f1a3de7eb5139c0853e' 
  AND token = '9ve018EKdliGe/5tySdv8dOgrhkyf3XBgYNN2vuore0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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