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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33e2089deec56ec4dabeb2e6742b161ec6822fcd16749fd8f9b02342fde3fb8' 
  AND token = 'ts3B1RJ7XYTvARwbqSDOgag2o846qJynLmT/+vZXidE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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