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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727fdcd16f149e2f30601915b942cab02412d774c307418f4b957f2e14dd8a70' 
  AND token = 'CnIr+P3PyC42MeNlMYqewo2uuw7NDHlPPly+BbvY1PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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