SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c1d72230ead34f558ee79029695b840c65752401044e9f3c10fd69287bf2a1' 
  AND token = 'OOBIbXnip7XXGv/efJUqreFj7FY6b7j0qnzK6eN8/ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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