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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3882163af63867c09af8f2020c8b10e6f871d58748d9fe5289e6ac335e8d837d' 
  AND token = '9RNmm3l1LSlqsywVL3vxfAGJvQMD96UlO2FW0WDtGDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00296

JSON explain

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