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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a153700cbb18980b7190fdda2bfbb8d6f7ea710cb982831e815b357124d5f3c5' 
  AND token = 'WOJAbkCp7xv1iK+sDQZiB00nKRsgybDmhaClJ7AhAao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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