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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfef55de05bd13f8c6e204e4948bcde70e36a68db7123de1624c81ceca6b89ca' 
  AND token = 'IFyBY06l1gURFdq0j91XlftkNj7AADjCy0a0aYfYsTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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