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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ca8a18c473f3a1db5339ba4d1c9fe20200844d01d8b821562a35feeb785ef0' 
  AND token = 'b6gdbcQxilBbiUESgH1777rcH1uwm4GRBYI+7zk8MFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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