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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a82810070ba4af3d815d4c0e12c8502df3f56dbae8cd2e95e5f1a2ed10d545c' 
  AND token = 'xeqKBTri5r+MUKNojffqJxVHZ1cI18+55w92f6GoAYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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