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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fe5507224749aa6939b31f418d5c7a586d577f5bfaadabb5885377f155fe96' 
  AND token = 'fqsvSJL3klfaEaWKZmdEmixFfftlcxfS3EJ5Nnt7sd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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