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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057e3c7ff45b561eb12b9dc36101543e0528aac84f7a993b076431b768aaf9ac' 
  AND token = 'QXNNyrC3T6AMlzk6lKshi2O7CI1HdAexNoqHt3R7WPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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