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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bcd79ed7907afdbb66590d8b5ccf2cbb8cc712e2ff146da2ba3eeacff0d9ec' 
  AND token = 'qZn63fcca70vkKsCzyNfU/TqFIcaG2vN7U5RcRPZ8zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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