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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99cb3cbd590eced8d9ca34f47bfd4ecc47ea0981b5e71e0e3712f2a04cf706c' 
  AND token = 'tECS7pmTY/TRDnGCrEWfPhV8qH8hDDiq0IupF+FnICU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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