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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5671f2de26fb30234849c626375eac812bbd8c68f38c3fc9af9ffac819e8d8' 
  AND token = 'eOib4lLqAzEEp9PaBqc75FiTDBh4kiOpq1fczE99FRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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