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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ad9d80645b248ca476dec4b88dbd5f82718d161ef91cfb4a0f55f156620836' 
  AND token = 'PCLAMEaA/D+0/uN60O6zW+aY7TicvwYxh+y0qwdN2lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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