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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea240bb4d01f769639516e37eab6867dde6ba997c8ba55fd2a66cfbccdd53fe' 
  AND token = '9HprCCz69UFH4KNiFeZciXq0Q+dGz2e3mtHveudyrrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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