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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bef27ec362abbd800bed6ef3d55b34443df2c5f1bc1fb2c7d81e807ec105b09' 
  AND token = 'PKwYdvhIsW8EbWpKgS2/de9FT2oUAQEGHlu0zIGTkmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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