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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e757dddfe4d63b5f9aaca07d5f4fc7bcee1a364e2ae1eabd5caf66611d5ea8f' 
  AND token = '6mhETr7a3oD++xD5KNnjnPa64URbyMyjx3SuLnvj5IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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