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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98213ae702b36c46da5953f346e219fba667e03c3e83d8f729a2afd22000dbb' 
  AND token = 'SzwUX2fsHhJ3IYlFJBwdDsW1G3dpYtrtY4/dZOxiJe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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