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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899bd00b1c8b0d16e2c811966a8bf716a2f41b601d4a05333ff384bc6c61574d' 
  AND token = 'y1dllKYLn4TKwiQGHs9ccTpA5I17AqlUxLYhOT2k8Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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