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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfaf1e9ea7b96e5ea22f7f1cb104a321f6748be1b2b4b2848098159f3ecb001' 
  AND token = 'zwUt4atTUT0ctB/t3ch6F5lLpoOb3gW1sRxYY5Mta5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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