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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52c4a39ad837819ac1d7aba04f83ff4ea476b16bb74b04ca8cf6c36c5bd16c7' 
  AND token = 'Tf7ZjLYLOOR+91EOV265P64NrF39vMcN3cwaNO2oa3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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