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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260549ff202e8ad11ca40fda756504a56c78cd737e6f37f4a81a1a223ac9b62a' 
  AND token = '/+K4LkN8ypjsVp8vykwfR2s1kmib5k5bNT61al/iXtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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