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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eae85e3d8657f41b40d01f8e3dc163faf6bd733ac442262f445a1c7ff0f24b3' 
  AND token = 's/+bt7cDFblnPNSPdnUstYF4SClLGhbZZf8McuB8YIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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