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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de2430d23ed725425a067d90f38625838fbb9ab721a79de2de4fd4ac9e2c032' 
  AND token = '5yHZvBMcI3DHUt1ZtSnDd7jr4dCg2mdXi9MxEyInf0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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