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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec28141154afd2e76db6b16f0d887ba3779d166f1f38e49dcf874713fe7fe18' 
  AND token = 'wIqbK46Ind4RxBG5iLcHA4nUeLruw39naads8+uC7xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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