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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f444ae1a083b068aea728bec60543dc04b573d2a6091cc281f22a3570e4ce28f' 
  AND token = '6gvmWtkGlPSUSjUXra6NWaq9U43Fm+G3Uj3cup8ro6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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