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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b138695b60d9da99dc9f343b4b08763d362cef65757d64bf476af8903af88a94' 
  AND token = 'ldLBWHwRzEfQ/9ShCtP71kA9WyYtevnhzxbzkuPWhwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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