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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0bd123d60140254f5b165a1e048180ee9ea15d0587bfe1d513abec20b74e85' 
  AND token = '3sK8cS8eshhHj3cCqrfpov/ZQtm4cCBOzKDtU+WwDNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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