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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774c68f5568fa621d1668944abe01028b1763705d0ca3f6d5b7d717a134ace7b' 
  AND token = 'Ho33RaZpPHYy7nWiw+kDg5/XAJQX+yD2udTYXJzyihY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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