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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819f7acc4eba60c662e9b3ac26bcbee5a858373f8a5b948984ab2f28dc35d3d0' 
  AND token = 'tt8Y5CRPqYhvGld0LKCAsdtCeJzP9Ht0XJ9fLtgkbuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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