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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8bc7078b44a576b2463221cf39faef84f6a9574289813c10da0e7770088c07' 
  AND token = 'QWcssIjKwC+NDmaBGswt12p36B49Jj3X4d8yf7WOQFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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