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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df0eddf8f3f8ff1e3450540c5ddfac4a78cdd1dddcd1c8dc1f2781838a08c69' 
  AND token = 'F4EXK02a4h3+zqY8ddJsTL5+ME34DZQdpNkEQDfvyOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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