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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf1504a676f7fcb4496a8c5f667e16820262e37c34289760e624239e65620e2' 
  AND token = 'BY5gU/GmK10RMMY1HWAll25UUKsVlD/Hh2+Lkj0SFsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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