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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707831f4e5f3bfcdbea980ace1e923e43e440862470050ad1900c9419c4601e8' 
  AND token = 'IKe2dsQSu8iQJkFPFV+4fEbSIEi47AGRJm5c0UNDf60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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