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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03777f05c5d2c01465bd96376010f628e176d9720bd67a51d77373dd8351bd7b' 
  AND token = '/Y7dPCdYhdsdjKnD3b6GpbopQlaE3UhgLptqtBX5BiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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