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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b9cd2dd45ca5470a09d8ffa512ece09cc33ad847d8cd408343001f5b3b4b32' 
  AND token = 'zzJSvSqSQSgOcH+4Tl5WDlkdIVL9RZ0zh1hpCJWtxeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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