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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa42ec1240c73f37784fb5702d1a71e209bab561e67a9b08c06af2cede193ac' 
  AND token = 'XaP+2f1ndl3tmIlJHyLnJPaM4Lz+as/Co8ho8spLhWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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