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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08f3ef21bf6fb3cce14a583586e1c72b4b6ddd61f7e967199562ccb8d6b83a9' 
  AND token = 'rdF7PtMGn4suvcQd1YtC12pUz77VdhDGMz/lLBHFGbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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