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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108a4bd663f485a9e6eb7f8b55231947012a6077f0ec5d54c517d5b44c780399' 
  AND token = 'Vdna5aZP68jkGy7/FfmM61vu782lOi1Hg0RJQUp6hZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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