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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b616732c9a2a50b1e7ee928e1ce72d078d658365e5578f2c7faf3f26ec3b8c' 
  AND token = 'q0Kkm4GJfELyMOU5eV1oLGgZqinx5UdlL4+ui3jzRcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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