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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52af399a75d725560ed00dc467de77bb63efd3e713717b85ee888a871b04be64' 
  AND token = 'kXj93R5LDkTfTVq4oo0LrluiLGYZTlswzsdfwGfwa4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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