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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b492d22e109893e59f2183deadf33b22fceb8b2ecad58e19e8d10d2c2e888d3b' 
  AND token = 'kQUoDodLP1PJk5YkFFAH48hD8qoCHABMsutRKLe5e3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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