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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65407ff624ed9b7ddd8e30323222887c0a1848a3776529badbe374493f8c401b' 
  AND token = '+uv0xRJRqdI5CBKCs5ehSdBLQFJ5biC66gr4ayKUKAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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