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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270aa26f16ee831b4e7de0d81eb34c852d69672f0844b6a4bc1d3c55635ed597' 
  AND token = 'kwv7bmLsO6L7330krUWVp56LuUdh2xVbUzI2cFdMdiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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