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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12ee0584181c7c716c83578f436abb8aa6441ae985a96cc9e2706b48b1cb657' 
  AND token = 'oufNlD2e9tK1QrPf+dclem6sSyC85uge4PziFbxWGsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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